Reflector for a light bulb



FIG. 1 is a top perspective view of a reflector for a light bulb, showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

CLAIM The ornamental design for a reflector for a light bulb, as shown and described. 